I've really and truly loved reading everyone's comments on this thread. Vegas is like our Disneyland, no gambling involved but we love seeing the sights, and walking outside in February.
So I know we'll enjoy it once we get there. The train/bus connection could be an interesting adventure, especially since desert is not something we are used to seeing here in SE Michigan (correct, Sarah) and we'll get a break from the snow.
What gives me pause about the connection in Kingman is the timing. I'm too old, and my kids still too young, to maintain much perspective on the adventure aspect of getting up in the wee hours of the morning to change accomodations. We did that 2 years ago on the EB, with a spirited and positive attitude, and could do so again if absolutely necessary... there's that word, necessary. People might well disagree but I'd rather ride Amtrak all the way to LAX, get up at a decent hour and then try the bus trip back to Nevada. It's not just the 1 am transfer time, it's the 4 am arrival time at LAS. What on earth do you do then? Most hotels that let you check in early probably won't let you check in THAT early, and paying for the previous night seems wasteful.
Anyway.... looking forward to this SWC trip, if we do go.